Many consider collecting a male-dominated hobby, with men dominating categories like stamps, cars and baseball cards. But a surge in luxury accessory sales in the secondary market, handbags in particular, have reinforced female dominance in accumulating items like Hermès handbags that can sell for five figures.

The Hermès Birkin bag, a line of bags made by the French luxury retailer and inspired by British actress Jane Birkin, has played a major part in attracting bona-fide collectors.

"Until very recently, people with lots of bags didn't self-identify as collectors. They were shoppers, buyers or 'fans of Chanel,'" said Matt Rubinger, director of luxury accessories for Heritage Auctions. "They weren't creating a collection with a lasting value or investment in mind. As we've hosted these auctions and people see how strong the market is, that has shifted."

Heritage Auctions recognized the growing popularity of the market and brought on Rubinger three and half years ago to launch the luxury accessories category.

Rubinger said that of Heritage's 35 categories, such as sports collectibles, they are all dominated by a male customer base, except for luxury accessories.

Because Hermès can have waiting lists that can span years for Birkin bags, handcrafted in France, the secondary market exploded with the prevalence of online retailers.

Websites Ruelala and Gilt host semi-regular sales for luxury handbags, but none are quite as expensive as Birkin bags.

On Monday, Heritage Auctions is hosting in Beverly Hills a "Fine Jewelry and Luxury Accessories Auction" that includes 68 Birkins out of 275 bags. The most sought-after item is a crocodile Birkin bag that was custom made with an indigo interior. It's estimated to be worth $60,000 to $70,000.

Crocodile Birkin bags can retail for $60,000 in Hermès stores; leather Birkin bags for about $10,000.

Why the big price tag? Rubinger doesn't deny that these bags are "not the norm" for most American households. Buyers with means are paying for both the brand and the quality, Rubinger explains.

"One craftsman sits in factory in southern France and starts with the first stitch, from start to finish. You pay for that craftsmanship," he said. "If they can't get enough of a certain material that meets their standards, they discontinue it."

Last year, Heritage Auctions launched weekly online auctions for luxury bags that start on Tuesday and last for seven days. About 75 designer bags start at $1 with no reserve.

"People get very excited when Tuesday rolls around and we see a spike in website traffic as people close out last week's weekly and see what's in the following auction," Rubinger said.

The idea of a weekly auction is not new, as Heritage has hosted them for other categories, like coins and comics. But for luxury accessories, to start at $1 is "groundbreaking," he said.

"There are lots of places for vintage bags. There aren't places that let them sell at market price," he said. "We don't underprice or overprice. We let people compete and it sells for whatever people want it for. We are really trying to be the market."

So what are Rubinger's tips to buying a luxury handbag as a collectible?

He said there are three key determinants of value that can apply to other collectibles: condition, rarity and desirability.

The reasons why the crocodile Birkin bag may fetch $70,000 is that it happens to be in "pristine" condition, which is a rare classification by Heritage's standards.

"It looks as it did the moment it came out of the boutique," he said. It's also one of a kind, because it was custom-ordered, which is indicated by a tiny horseshoe stamp next to the Hermès signature. The indigo interior is also not common among Birkin bags.

Its size, 35 centimeters, known informally as a medium-size Birkin bag, is also practical for use and "desirable," Rubinger said.

Personal preference and how you're going to use a bag influences an item's desirability. And yes, even though these bags cost thousands of dollars, they are indeed used by collectors who own them.